| Action Date |
Action |
Description |
DEC Staff |
| 6/15/1994 |
Leaking Underground Storage Tank Release Confirmed - Petroleum |
LUST Site created in CSP for source area ID 77868 Site added to database. |
Lynne Bush |
| 6/15/1994 |
Leaking Underground Storage Tank Cleanup Initiated - Petroleum |
LUST corrective action underway. LCAU date changed DB conversion |
Lynne Bush |
| 6/15/1994 |
Site Added to Database |
|
Former Staff |
| 7/20/1994 |
Update or Other Action |
Received a copy of the HartCrowser "Work Plan for Fire Station No. 4 Remedial Site Investigation" dated 7/19/94. |
Lynne Bush |
| 8/1/1994 |
Long Term Monitoring Established |
Monitoring wells MW-1 through 4 were sampled this date as the first of numerous samplings for long-term monitoring. |
Lynne Bush |
| 9/2/1994 |
Update or Other Action |
The CSP received a copy of the HartCrowser "Fire Station No. 4 Gasoline and Diesel UST Closure" dated 7/14/94. GRO to 10,000 mg/kg, DRO to 8,500 mg/kg, benzene to 16 mg/kg, and BTEX to 2,416 mg/kg in excavation soil samples. GRO to 1,400 mg/kg, DRO to 16,000 mg/kg, benzene to 0.86 mg/kg, and BTEX to 90.6 mg/kg in stockpile soil samples. A passive vent system with riser was installed and the excavation backfilled with clean gravel. An approximate 97 cubic yard soil stockpile resulted from the excavation. GW flow direction measured on 8/1/94 was northeast. |
Lynne Bush |
| 10/15/1994 |
Leaking Underground Storage Tank Corrective Action Underway |
Reviewed corrective action plan. |
Former Staff |
| 10/19/1994 |
Leaking Underground Storage Tank Corrective Action Underway |
Approved the transport of approximately 97 cubic yards of petroleum contaminated soil to Alaska Soils Recycling for thermal remediation. |
Lynne Bush |
| 12/19/1994 |
Update or Other Action |
Received a letter from Alaska Soils Recycling dated 12/12/94 indicating that 184.23 tons of petroleum contaminated soil was received from the site and on 11/10/94 thermal remediation of the soils was completed. Analysis of the treated soil indicates that it met or exceeded the most restrictive ADEC soil cleanup levels. |
Lynne Bush |
| 1/13/1995 |
Leaking Underground Storage Tank Corrective Action Underway |
The HartCrowser Corrective Action Plan dated 10/19/94 was approved in a meeting. |
Lynne Bush |
| 1/17/1995 |
Release Investigation |
Reviewed release investigation. |
Former Staff |
| 9/16/1995 |
Update or Other Action |
CAPR; Reviewed files. Reviewed the HartCrowser Corrective Action Start Up Report, Anchorage Fire Department Station No. 4, Anchorage, Alaska" dated June 1995. GW flow direction based on 9/8/94 data is to the north-northeast. Up to 1.87 feet of floating free-phase liquid hydrocarbon was measured in MW-1. Recovery wells RW-1 and RW-2 were drilled in the vicinity of the former UST excavation in January 1995. No hydrocarbons were recovered from RW-2. Hydrocarbon thickness in MW-1 declined from a maximum thickness of 2.7 feet in mid-January 1995 to 1.3 feet in March. A decline of another foot between March and April 1995 occurred and was probably the result to rising ground water. No BTEX constituents were detected in GW samples for MW-3 or MW-4 in January 1995. No BTEX constituents or DRO concentrations were detected in GW samples for MW-2 or MW-4 in April 1995. |
Former Staff |
| 10/1/1995 |
Document, Report, or Work plan Review - other |
Reviewed the HartCrowser report "Remediation System Operation and Monitoring, May through July 1995" dated August 1995. Hydrocarbon thickness in MW-1 remained in a range from 0.31 to 0.39 feet during the time period. MW-1 was not sampled due to the presence of floating petroleum hydrocarbons. Sampling results in MWs 2 through 4 were all ND for benzene and BTEX. DRO was 0.17 mg/l in MW-2, 0.27 mg/l in MW-3, and 0.16 mg/l in MW-4. GW flow direction was northeast on 7/27/95. |
Lynne Bush |
| 5/22/1996 |
Update or Other Action |
Received a copy of the HartCrowser report " Remediation System Operation and Monitoring, November 1995 through January 1996" dated 2/29/96. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 ranged from 0.4 foot to 0.73 foot. Notable amounts of hydrocarbons were recovered in RW-2 beginning 9/22/95 and continued through the subject report period. MWs 2 through 4 were ND for benzene and Total BTEX except MW-2 detected Total BTEX at 0.0006 mg/l and its duplicate was ND. The detected DRO results in MWs 2 through 4 was 0.30 mg/l (0.17 mg/l in its duplicate), 0.16 mg/l, and 0.14 mg/l, respectively, in all three of these MWs. The GW flow direction resulting from the 1/24/96 sampling was northeasterly. |
Lynne Bush |
| 7/17/1996 |
Document, Report, or Work plan Review - other |
The department received and reviewed a copy of the HartCrowser report " Remediation System Operation and Monitoring, January 25, 1996 through May 10, 1996" dated 6/14/96. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 decreased from 0.79 foot to 0.37 foot. MWs 2 through 4 were sampled on 5/10/96 and were ND for benzene, Total BTEX, and DRO except the duplicate sample for DRO in MW-2 was 0.47 mg/l. The GW flow direction resulting from the 1/24/96 sampling was northeasterly. |
Lynne Bush |
| 8/29/1996 |
Document, Report, or Work plan Review - other |
The department received and reviewed a copy of the HartCrowser report " Remediation System Operation and Monitoring, May 11, 1996 through August 6, 1996" dated 8/29/96. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 ranged from 0.26 foot to 0.30 foot. RW-2 continued to recover notable amounts of hydrocarbons. MWs 2 through 4 were sampled on 8/6/96 and were ND for benzene and Total BTEX. DRO sample results were detected in MWs 2 through 4 and ranged from 0.11 mg/l in MW-4 to 0.21 mg/l in MW-3. The GW flow direction resulting from the 1/24/96 sampling was east-northeasterly. |
Lynne Bush |
| 5/1/1997 |
Document, Report, or Work plan Review - other |
The department received and reviewed a copy of the HartCrowser report " Remediation System Operation and Monitoring, August 7, 1996 through November 20, 1996" dated 12/26/96. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 on 11/20/96 was 0.32 foot. RW-2 continued to recover notable amounts of hydrocarbons. MWs 2 through 4 were sampled on 11/20/96 and were ND for benzene and Total BTEX. DRO sample results were detected in MWs 2 (0.12 mg/l) and 4 (0.11 mg/l). The GW flow direction resulting from the 11/20/96 sampling was east-northeasterly. |
Lynne Bush |
| 11/20/1997 |
Update or Other Action |
ADEC sends Notification of Intent to Cost Recover Letter to current owner: Municipality of Anchorage, FMD. |
Lynne Bush |
| 2/4/1999 |
Document, Report, or Work plan Review - other |
After review of the 7/17/98 HartCrowser "Groundwater Monitoring" report received by the department on 10/10/98, the department sent a letter to the RP this date requesting that remedial activities occur to address soil contamination and free product at MW-1. A work plan for free product recovery and a written report detailing the various soil remediation technologies should be prepared and was requested submitted by 3/31/99. The most viable methods should be discussed at length. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 ranged between 0.23 foot and 1.12 foot during the period between 11/21/06 and 5/28/97. During the period between 11/21/96 and 5/28/97,MWs 2 through 4 were sampled and were ND for benzene and Total BTEX except MW-3 was 0.001 mg/l for Total BTEX on 7/11/97. DRO sample results were ND during the same period except the 2/19/97 sampling event detected levels at 0.14 mg/l in MW-2, 0.15 mg/l in MW-3, and 0.20 mg/l in MW-4. The GW flow direction resulting from the 11/20/96 sampling was northeasterly. |
Lynne Bush |
| 2/26/1999 |
Document, Report, or Work plan Review - other |
The department reviewed a copy of the HartCrowser report "Groundwater Monitoring" dated 11/23/98 and received 2/3/99. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 on 10/7/98 was 0.75 foot. MWs 2 through 4 were sampled on 10/7/98 and were ND for DRO, benzene, and Total BTEX except for Total BTEX in MW-4 which was 0.0018 mg/l. The GW flow direction resulting from the 10/7/99 sampling was northeasterly. |
Lynne Bush |
| 4/4/2001 |
Update or Other Action |
Reminded the MOA of the need to provide reports (conversation with Jon Clark). |
Lynne Bush |
| 7/24/2003 |
Update or Other Action |
Site transferred from Lynne Bush to Amanda Dreyer. |
Amanda Dreyer |
| 7/26/2004 |
Document, Report, or Work plan Review - other |
Received and reviewed a copy of the HartCrowser report "Groundwater Monitoring, Anchorage Fire Department Station No. 4" dated 7/22/04. MW-1 was not sampled at all due to the presence of floating product. Hydrocarbon thickness in MW-1 on 5/25/04 was 0.07 foot. MWs 2 through 4 were sampled on 5/25/04 and were ND for GRO, DRO, and Total BTEX. The GW flow direction resulting from the 5/25/04 sampling was northeasterly. |
Amanda Dreyer |
| 3/1/2006 |
Document, Report, or Work plan Review - other |
The ADEC, CSP completed review of the HartCrowser "Groundwater Monitoring Report, Anchorage Fire Department Station No.4, 4350 MacInnes Street, Anchorage, Alaska" dated 7/22/04.
In June 1994, one gasoline and one diesel USTs were removed from the site. Soil removal was limited by the excavations proximity to the Fire Station Building. A release investigation (RI) was completed following UST removal. Four groundwater monitoring wells were installed as part of the RI. Groundwater sampling identified free-phase petroleum product in the vicinity ofthe former UST's. Two product recovery wells were installed at the site in January 1995. Petrotrap passive hydrocarbon pumps were installed to collect free product. These pumps were operated through November 1996 and a total volume of 21 gallons ofhydrocarbons was recovered. The four monitoring wells were sampled quarterly during 1995 and 1996 and then semiannually in 1997 and 1998. No contaminants were found above regulatory levels in MW-2, MW-3a or MW-4. MW-1 exhibited free product during all sampling events.
On May 25,2004, monitoring wells MW-1, MW-2, MW3a & MW-4 were rehabilitated and resurveyed to provide accurate elevation measurements. Free product and groundwater elevations measurements were collected. MW-1 continued to exhibit free product. Groundwater collected from MW-2, MW-3a & MW-4 did not contain any
detectable contamination.
Groundwater data has remained stable since installation of the monitoring wells in 1994. There has been no detections of contamination above regulatory levels in MW-2, MW-3a, or MW-4. Free-phase petroleum has been measured in MW-1 from the first sample collected following installation to date. Remaining contaminated soil can not be removed from the ground due to it's proximity to the Fire Station Building. |
David Pikul |
| 11/1/2006 |
Update or Other Action |
File number issued 2100.26.315 (FKA L69.47). |
Aggie Blandford |
| 11/28/2006 |
Document, Report, or Work plan Review - other |
Received and reviewed a copy of the HartCrowser report "AFD-4 Groundwater Monitoring, Anchorage Fire Department Station Number 4" dated 11/22/06. MW-3 was not sampled at all due to the presence of ~6" of puddled water above the access cap. No free phase hydrocarbons were found in MW-1, 2, or 4. However, the above average rainfall during August 2006 likely caused a rise in the water table that may have pinched off any free-phase hydrocarbons from entering MW-1. It is likely that some contaminated soils likely remain beneath the northeast corner of the building. MWs 1 and 2 were sampled on 9/18/06 and 10/11/06. MW-2 was ND for GRO, DRO, and Total BTEX. MW-1 was above cleanup level for GRO, DRO, and Total BTEX. The GW flow direction resulting from the 9/18/06 sampling was northeasterly. A Conceptual Site Model was submitted with the report as well. |
David Pikul |
| 12/6/2006 |
Leaking Underground Storage Tank Corrective Action Underway |
Reviewed the Hart Crowser "Draft Remedial Action Plan, Former AFD Station Number 4; Anchorage, Alaska" dated 12/5/06. Sent a letter this date that conditionally approved the plan. Conditions include increasing the post-excavation soil samples to six and also including a duplicate. A potential for post construction monitoring of indoor air exists should site conditions indicate a completed vapor intrusion pathway. |
David Pikul |
| 12/11/2006 |
Leaking Underground Storage Tank Corrective Action Underway |
Received the Hart Crowser "Remedial Action Plan, Former AFD Station Number 4; Anchorage, Alaska" dated 12/7/06. |
David Pikul |
| 4/26/2007 |
Update or Other Action |
In a faxed response to Nino Muniz of HartCrowser the ADEC did not object to the request to the proposed transport of contaminated soil to Anchorage Soils Recycling for thermal remediation provided it is containerized and covered during transport. |
David Pikul |
| 4/30/2007 |
Long Term Monitoring Complete |
The last of four monitoring wells was decommissioned this date. |
Bill Petrik |
| 6/1/2007 |
Update or Other Action |
Received a letter this date from Alaska Soils Recycling (ASR) dated 5/30/07 indicating that ASR received 51.36 tons of petroleum impacted soil from this site. This soil will be co-mingled with soils of similar contaminants. Upon thermal remediation, these soils will be reintroduced into the construction industry as classified material. Due to this co-mingling at ASR there is no further action needed for this particular stockpile of contaminated soil. |
Bill Petrik |
| 6/6/2007 |
Update or Other Action |
Site management transferred from Pikul to Petrik. |
Shannon Oelkers |
| 6/12/2007 |
Document, Report, or Work plan Review - other |
Reviewed the 5/14/07 HartCrowser "Remedial Action Report for AFD Station #4" received by the CSP on 5/16/07. The fire station structure is being expanded such that the apparatus bay will be located above the former UST excavation area. The primary exposure pathway of concern is upward migration of fuel vapors from the free-phase hydrocarbons and contaminated soil and GW from the subsurface into the building. Monitoring wells MW-1, RW-1 and RW-2 were removed and the soil in the vicinity of these MWs was excavated to expose the GW and free-phase hydrocarbons located within the former UST excavation. Approximately 230 cubic yards of material was excavated that was below 15 ppmV while approximately 45 cubic yards were excavated that were above 15 ppmV and stored on a liner for later removal to ASR. 100 pounds of ORC-A was placed into the GW within the excavation and another 50 pounds was placed in the smear zone just above the water table after soil was backfilled. The remainder of the excavation was back-filled with clean soils. No soil exceedances for GRO and BTEX except for 7.49 mg/kg ethylbenzene in sample S2-SW. DRO exceedances occurred in sample S2-SW at 2,350 mg/kg and in sample EX-1 at 7,160 mg/kg and its duplicate at 3,940 mg/kg. |
Bill Petrik |
| 7/11/2007 |
Update or Other Action |
Latitude and longitude data gathered from TopoZone Pro Hi-Res Aerial Photo, Large Map, 1:2,952 scale, No Topo Base Map, NAD83 in conjunction with the Anchorage Area Atlas and a site map depicting both UST locations. High degree of confidence in the accuracy of the coordinates. Can only be improved with site GPS. |
Bill Petrik |
| 7/18/2007 |
Exposure Tracking Model Ranking |
Initial ranking. |
Bill Petrik |
| 11/29/2007 |
Document, Report, or Work plan Review - other |
The CSP reviewed the MOA "AFD-4 Excavation and Well Decommissioning" report dated May 14, 2007; the "AFD-4 Remedial Action Memorandum" dated June 27, 2007; and the "Updated Conceptual Site Model (CSM)" dated August 3, 2007. The CSP composed a letter and mailed it this date in response to review of these documents. The CSP requested completion of a subsurface soil gas sample beneath the slab floor in the area closest to the former location of MW-1. If the building is still in the construction phase it would be optimal to conduct the sampling after final construction is complete and before occupancy. A work plan to perform this work was requested to the CSP by January 31, 2008.
Pending the outcome of potential vapor intrusion investigative work, the CSP reserves a determination for further ground water or indoor air vapor intrusion investigative work in the area of the former tanks and under the foundation nearest this point.
Before site closure can be achieved a replacement monitoring well will need to be installed in the area of the former MW-1 and samples documented to be below the 18 AAC 75.345 Table C cleanup levels for DRO, GRO, and BTEX.
In regards to the “clean” stockpile that was created during excavation activities on April 30, May 1 and May 9, 2007 that were segregated based on PID readings less than 15 ppmV, the CSP requested whether there were any samples of these soils taken and sent for laboratory analysis to determine any extent of potential contamination. If not, please explain why not and the rationale behind using 15 ppmv PID as a screening value.
The responsible party (RP) was also requested to: supply PID readings for sampled soils as they were not listed in the reports; disposal receipts for the 275 gallons of free-phase hydrocarbons and ground water emulsion that were pumped into an on-site storage tank on May 1, 2007 and subsequently pumped out by Emerald Services for disposal; and update the CSM as site conditions change in the future.
In accordance with 18 AAC 78.910 and 40 CFR 280.113 the RP is required to maintain financial responsibility (FR) until the tank has been properly closed as required by 18 AAC 78.085 and corrective action has been completed. |
Bill Petrik |
| 5/16/2008 |
Underground Storage Tank Site Characterization or Assessment |
A conditional work plan approval letter for the Municipality of Anchorage Fire Station #4 was sent. The work plan is to determine whether a vapor intrusion issue exists for the building. |
Bill Petrik |
| 8/18/2008 |
Document, Report, or Work plan Review - other |
The CSP performed a review of the Shannon & Wilson, Inc. "Request to Transport and Treat Impacted Soil and Water, Anchorage Fire Department Station No. 4, 4350 MacInnes Street, Anchorage, Alaska" dated August 15, 2008. The site has residual hydrocarbon contamination above cleanup levels remaining under and adjacent to old and new construction. A borehole was drilled and sampled and a subsequent monitoring well installed and sampled in an attempt to further characterize the soil and ground water with respect to potential vapor intrusion. High levels of GRO, DRO, and BTEX above cleanup levels were detected in soil and groundwater. Approval was granted to transport and treat the impacted soil and water. |
Bill Petrik |
| 10/24/2008 |
Exposure Tracking Model Ranking |
Initial ranking with ETM completed for source area id: 77868 name: Former 500 gal Diesel & 1K gal Gasoline USTs. In response to an email from Janice Wiegers regarding a discrepancy in the Exposure Tracking Model ranking for the Ingestion of Groundwater, revised this page to reflect the fact that no drinking water wells have been impacted by the site. |
Bill Petrik |
| 4/20/2009 |
Update or Other Action |
Talked with Nick Protos of Shannon & Wilson, Inc. about current site status and potential future work. |
Bill Petrik |
| 6/20/2012 |
Document, Report, or Work plan Review - other |
Received Monitoring Well Installation, Anchorage Fire Department Station No. 4 MacInnes Street, Anchorage, Alaska ADEC Reckey Number 199420024503, Event ID #00407 dated December 12, 2008. One borehole was advanced and turned into monitoring well. Soil samples exceed cleanup levels for GRO and BTEX. Water samples exceed cleanup levels for GRO, DRO, and BTEX. |
Katrina Chambon |
| 8/21/2012 |
Document, Report, or Work plan Review - other |
Review of Monitoring Well Installation, Anchorage Fire Department Station No. 4, 4350 MacInnes Street, Anchorage, Alaska ADEC Reckey Number 1994210024503, Event ID #00407 dated December 12, 2008.
The report details the installation and sampling of one borehole that was completed as a groundwater monitoring well in the contaminant source area. The 2008 soil and groundwater samples contained contaminant concentrations above 18 AAC 75.341 and 18 AAC 75.345 cleanup levels, specifically gasoline range organics (GRO), diesel range organics (DRO ), benzene, toluene, ethylbenzene, and xylenes (BTEX).
Contaminated Sites Program requests:
The nature and extent of groundwater contamination must be delineated by installing and sampling additional groundwater monitoring wells.
|
Katrina Chambon |
| 1/25/2013 |
Site Characterization Workplan Approved |
The work plan proposes to advance three boreholes, install groundwater monitoring wells in the borings, soil and groundwater sampling, laboratory testing, a monitoring well survey and preparation of a report. This work plan is approved with the following condition:
Please provide three (3) working days advance notice when planning to do work, to give us an opportunity to be on site to inspect.
|
Katrina Chambon |
| 4/15/2013 |
Site Visit |
Site visit to observe soil sampling and groundwater monitoring well. |
Katrina Chambon |
| 7/8/2013 |
Offsite Soil or Groundwater Disposal Approved |
|
Katrina Chambon |
| 11/20/2013 |
Site Characterization Report Approved |
CSP reviewed Additional Site Characterization Fire Station No. 4, Anchorage, AK dated September 2013. Three boreholes that were completed as groundwater monitoring wells were installed. The soil samples results were below cleanup levels. One groundwater sample had DRO up to 1.81 mg/L, which is above the cleanup level of 1.5 mg/L. Monitoring well B1MW had 0.03 feet of product on the groundwater. CSP requests that biannual groundwater sampling occur in order to determine a trend. |
Katrina Chambon |
| 11/20/2013 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77868 Former 500 gal Diesel & 1K gal Gasoline USTs. |
Katrina Chambon |
| 2/21/2014 |
Document, Report, or Work plan Review - other |
The project activities will consist of collecting groundwater samples from Wells B1MW and
B2MW during winter and summer 2014, conducting free-product recovery (if encountered),
laboratory analysis of the groundwater samples, managing investigation-derived waste (IDW),
and preparing a summary report. This work plan has been approved. |
Katrina Chambon |
| 3/21/2014 |
Offsite Soil or Groundwater Disposal Approved |
|
Katrina Chambon |
| 5/2/2014 |
Update or Other Action |
The CSP spoke with S&W on this day. S&W indicated that groundwater (GW) sampling was last performed in March 2014, and the next event is scheduled for July 2014. Following the final 2014 GW sampling events, a report will be prepared. |
Joshua Barsis |
| 8/14/2014 |
Update or Other Action |
CSP spoke with fire station training specialist to determine if perfluorooctane sulfonate (PFOS), which was used in the manufacturing of AFFF (PFOS-based AFFF) prior to 2003, was every used for firefighter training at this fire station. This fire station (including the use of fire fighting foam) has not been used for fire fighting training. Thus, it is unlikely that PFCs would be present in the soil or groundwater. PFOS/PFOA GW samples not required at this time. |
Joshua Barsis |
| 11/3/2014 |
Institutional Control Record Established |
Institutional Controls established and entered into the database. |
Joshua Barsis |
| 5/20/2015 |
Document, Report, or Work plan Review - other |
Reviewed the 2014 Semi-Annual Groundwater Monitoring Fire Station No. 4 report, dated for February 2015. The objective of this project was to collect groundwater samples from two groundwater monitoring wells (B1MW and B2MW) in February 2014 and again in July 2014. However, a water sample was not collected from B1MW during the February sampling event because free floating petroleum product was encountered. The product was subsequently soaked up with an absorbent pad. Both wells, B1MW and B2MW, were sampled during the July 2014 sampling event.
Samples collected from Well B2MW did not exhibit any contaminant concentrations above ADEC groundwater cleanup levels. The sample collected from B1MW in July exhibited concentrations of gasoline range organics (GRO) at 138 mg/L, diesel range organics (DRO) at 18.1 mg/L, benzene at 7.69 mg/L, toluene at 29.7 mg/L, ethylbenzene at 2.40 mg/L, and xylenes at 15.6 mg/L, all of which exceed their respective groundwater cleanup levels.
ADEC requested additional groundwater sampling before the end of September 2015. |
Joshua Barsis |
| 6/27/2016 |
Document, Report, or Work plan Review - other |
Reviewed the Work Plan for Groundwater Monitoring, dated for June 27, 2106 for the MOA - Fire Station #4 site. Proposed activities consist of collecting water samples from four onsite monitoring wells (B1MW through B4MW). Sample analysis include GRO, DRO, RRO, and BTEX. B1MW will also be analyzed for VOCs and PAHs (at the request of ADEC). |
Joshua Barsis |
| 10/26/2016 |
Document, Report, or Work plan Review - other |
Reviewed the document titled August 2016 Groundwater Monitoring, and dated October 5, 2016. The objective of this project was to collect groundwater samples from four onsite groundwater monitoring wells (B1MW through B4MW), evaluate contaminant trends, and complete product recovery as necessary. A water sample was not collected from B1MW during the August sampling event because 0.01 foot of free floating petroleum product was encountered. The product was subsequently soaked up with an absorbent pad. Wells B2MW through B4MW were sampled on August 10, 2016. None of the wells sampled exhibited contaminant concentrations above the laboratory limits of quantitation, or in excess of the applicable groundwater cleanup levels. |
Joshua Barsis |
| 5/22/2017 |
Document, Report, or Work plan Review - other |
Reviewed the document titled Work Plan for Groundwater Monitoring, dated April 19, 2017. Proposed activities generally consist of collecting water level measurements from four onsite groundwater monitoring wells (B1MW through B4MW), conducting product recovery from B1MW, and collected analytical water samples from Wells B1MW (in the absence of free product) and B2MW. |
Joshua Barsis |
| 12/11/2017 |
Document, Report, or Work plan Review - other |
Reviewed the document titled September 2017 Groundwater Monitoring, and dated November 1, 2017. Groundwater samples were collected from Monitoring Wells B1MW and B2MW. Well B1MW has historically contained product and for that reason cannot always be sampled. The sample collected from Well B1MW contained levels of gasoline range organics (GRO), diesel range organics (DRO), and benzene, toluene, ethylbenzene, and xylenes up to 86 mg/l, 13.8 mg/l, 10.4 mg/l, 23.4 mg/l, 2.65 mg/l, and 15.9 mg/l, respectively; all of which exceed the Table C groundwater cleanup levels. The sample collected from Well B2MW did not exhibit any contaminants concentrations in excess of the Table C levels. |
Joshua Barsis |
| 2/10/2020 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77868 Former 500 gal Diesel & 1K gal Gasoline USTs. |
Joshua Barsis |
| 12/5/2021 |
Update or Other Action |
Site update requested from the Responsible Party. Looking at possibility of closing the site with ICs and evaluating for closure. |
Jessica Hall |
| 12/15/2021 |
Update or Other Action |
Review site file for next steps. Requested site update from RP. Need to discuss the site recieving a covenant and closing with ICs. |
Jessica Hall |
| 12/15/2021 |
Exposure Tracking Model Ranking |
A new updated ranking with ETM has been completed for source area 77868 Former 500 gal Diesel & 1K gal Gasoline USTs. |
Jessica Hall |
| 2/9/2022 |
Update or Other Action |
Per email from MOA/Maintenance & Operations dated 1/27/2022, the vapor barrier was installed, the red section is where the 15-mil liner was installed in area labeled as Apparatus 127 and 10 mil vapor barrier indicated as blue section, was installed in Apparatus 126, 128, and 135 (dormitory/Hallway area). See Figure 2021.01.27 VaporBarrierAirScrubbers in site file. MOA assumes that there is also 10-mil installed under the slab above the 15-mil liner to ensure that any moisture from the fill above the liner would be prevented from permeating the slab above. Also, heated slab in the apparatus bay was installed creating a 2” layer of rigid foam above the 10-mil vapor barrier. Since this is foamboard it may be considered a vapor barrier also.
Eight air scrubbers were installed in the bay, however it would appear that they are activated by an optical sensor that would presumably see the truck exhaust. There is no record of any air quality sampling or performance testing done after scrubbers were installed. |
Jessica Hall |
| 2/11/2022 |
Update or Other Action |
Sent email requesting the next steps from RP as follows:1.Please do another sampling event at B1MW. Please confirm if free product present, if present please demonstrate it is non recoverable. If no free product please sample for DRO, GRO, SVOCs, and VOCs per ADFG Appendix F for Diesel or Gasoline.
2.Please propose and submit a work plan for indoor air sampling in the dormitory location to confirm effectiveness of vapor barrier and scrubbers.
3.Please complete the building survey from vapor intrusion guidance, attached.
4.Please proceed with covenant process attached. The details of the approved covenant will be placed in the final closure letter and will need to be finalized before closure.
5.Please note that a well decommission plan will need to be submitted and wells will need to be decommissioned before closure.
|
Jessica Hall |
